Kimberley Strassel of the Wall Street Journal editorial board joined Tucker Carlson to explain why she believes the "largely discredited" Trump-Russia dossier was "one of the dirtiest political tricks in U.S. history."

In a recent column, Strassel wrote: "The Democratic National Committee and the Clinton campaign hired the opposition-research firm Fusion GPS in April 2016 to dig up dirt on Donald Trump. Fusion in turn hired former U.K. spook Christopher Steele to assemble the (now largely discredited) dossier. That full dossier of allegations wasn’t made public until after the election, in January 2017. And the media and Democrats continue to peddle the line that it played no role during the election itself."

Strassel said she believes it's a stretch to even call the information on Trump a "dossier," labeling it more like low-quality opposition research.

"This is a document based on anonymous Russian sources apparently. They've never been proven. A lot of them have been disproven," she told Tucker.

Strassel said it was "particularly clever" for the DNC to send the documents to the FBI and then brief the press on it.

"Then the press was able to claim this was intelligence that the FBI possessed and it gave it some air of credibility," she explained.

Strassel also said it's not true for Democrats to claim that the information was not used during the campaign, recalling that Steele briefed journalists in September 2016 on his research.

Both agreed that the biggest question is whether the dossier was used by the FBI to obtain a court order to wiretap members of the Trump team.

"Did this document actually inspire the FBI to end up wiretapping a political campaign? [That is] no small deal," said Strassel, adding that the FBI has been "playing hardball" on letting House investigators see the relevant files.

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